Spray gun



FIG. 1 is a front elevational view of a spray gun showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a top, left, front perspective view thereof; and,

FIG. 8 is a top, right, front perspective view thereof.

The broken lines show portions of the spray gun that form no part of the claimed design. 

CLAIM The ornamental design for a spray gun, as shown and described. 